errors

README

Package errors v2.2.0

The package errors contains various utility regarding errors management.

Documentation

Index

• func Errorf(ctx context.Context, format string, args ...interface{}) error
• func IsRootCause(err error, mytype interface{}) bool
• func New(ctx context.Context, message string) error
• func Newf(ctx context.Context, format string, args ...interface{}) error
• func NoteMask(ctx context.Context, err error, message string) error
• func Notef(ctx context.Context, err error, format string, args ...interface{}) error
• func RootCause(err error) error
• func RootCtxOrFallback(ctx context.Context, err error) context.Context
• func UnwrapError(err error) error
• func Wrap(ctx context.Context, err error, message string) error
• func Wrapf(ctx context.Context, err error, format string, args ...interface{}) error
• type ErrCtx
  • func (err ErrCtx) Ctx() context.Context
  • func (err ErrCtx) Error() string
• type ValidationErrors
  • func (v *ValidationErrors) Error() string
• type ValidationErrorsBuilder
  • func NewValidationErrorsBuilder() *ValidationErrorsBuilder
  • func (v *ValidationErrorsBuilder) Build() *ValidationErrors
  • func (v *ValidationErrorsBuilder) Get(field string) []string
  • func (v *ValidationErrorsBuilder) Merge(verr *ValidationErrors) *ValidationErrorsBuilder
  • func (v *ValidationErrorsBuilder) MergeWithPrefix(prefix string, verr *ValidationErrors) *ValidationErrorsBuilder
  • func (v *ValidationErrorsBuilder) Set(field, err string) *ValidationErrorsBuilder

Functions

func Errorf

func Errorf(ctx context.Context, format string, args ...interface{}) error

func IsRootCause

func IsRootCause(err error, mytype interface{}) bool

IsRootCause return true if the cause of the given error is the same type as mytype. This function takes the cause of an error if the errors stack has been wrapped with errors.Wrapf or errgo.Notef or errgo.NoteMask or errgo.Mask.

Example:

errors.IsRootCause(err, &ValidationErrors{})

func New

func New(ctx context.Context, message string) error

func Newf

func Newf(ctx context.Context, format string, args ...interface{}) error

func NoteMask

func NoteMask(ctx context.Context, err error, message string) error

func Notef

func Notef(ctx context.Context, err error, format string, args ...interface{}) error

func RootCause

func RootCause(err error) error

RootCause returns the cause of an errors stack, whatever the method they used to be stacked: either errgo.Notef or errors.Wrapf.

func RootCtxOrFallback

func RootCtxOrFallback(ctx context.Context, err error) context.Context

RootCtxOrFallback unwrap all wrapped errors from err to get the deepest context from ErrCtx errors. If there is no wrapped ErrCtx RootCtxOrFallback returns ctx from parameter.

func UnwrapError

func UnwrapError(err error) error

UnwrapError tries to unwrap `err`. It unwraps any causer type, errgo and ErrCtx errors. It returns nil if no err found. This provide the possibility to loop on UnwrapError by checking the return value. E.g.:

for unwrappedErr := err; unwrappedErr != nil; unwrappedErr = UnwrapError(unwrappedErr) {
	...
}

func Wrap

func Wrap(ctx context.Context, err error, message string) error

func Wrapf

func Wrapf(ctx context.Context, err error, format string, args ...interface{}) error

Types

type ErrCtx

type ErrCtx struct {
	// contains filtered or unexported fields
}

func (ErrCtx) Ctx

func (err ErrCtx) Ctx() context.Context

func (ErrCtx) Error

func (err ErrCtx) Error() string

type ValidationErrors

type ValidationErrors struct {
	Errors map[string][]string `json:"errors"`
}

ValidationErrors store each errors associated to every fields of a model

func (*ValidationErrors) Error

func (v *ValidationErrors) Error() string

type ValidationErrorsBuilder

type ValidationErrorsBuilder struct {
	// contains filtered or unexported fields
}

ValidationErrorsBuilder is used to provide a simple way to create a ValidationErrors struct. The typical usecase is:

func (m *MyModel) Validate(ctx context.Context) *ValidationErrors {
	validations := document.NewValidationErrorsBuilder()

	if m.Name == "" {
		validations.Set("name", "should not be empty")
	}

	if m.Email == "" {
		validations.Set("email", "should not be empty")
	}

	return validations.Build()
}

func NewValidationErrorsBuilder

func NewValidationErrorsBuilder() *ValidationErrorsBuilder

NewValidationErrors return an empty ValidationErrors struct

func (*ValidationErrorsBuilder) Build

func (v *ValidationErrorsBuilder) Build() *ValidationErrors

Build will send a ValidationErrors struct if there is some errors or nil if no errors has been defined

func (*ValidationErrorsBuilder) Get

func (v *ValidationErrorsBuilder) Get(field string) []string

Get will return all errors set for a specific field

func (*ValidationErrorsBuilder) Merge

func (v *ValidationErrorsBuilder) Merge(verr *ValidationErrors) *ValidationErrorsBuilder

Merge ValidationErrors with another ValidationErrors

func (*ValidationErrorsBuilder) MergeWithPrefix

func (v *ValidationErrorsBuilder) MergeWithPrefix(prefix string, verr *ValidationErrors) *ValidationErrorsBuilder

MergeWithPrefix is merging ValidationErrors in another ValidationError adding a prefix for each error field

func (*ValidationErrorsBuilder) Set

func (v *ValidationErrorsBuilder) Set(field, err string) *ValidationErrorsBuilder

Set will add an error on a specific field, if the field already contains an error, it will just add it to the current errors list